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Finding the Fourth Proportional to 98.45, 135.87 and 70.91

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Solution

The fourth proportional to 98.45, 135.87 and 70.91 is: 97.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.45 : 135.87 = 70.91 : x
  2. Step 2: Convert to fraction form
    98.45/135.87 = 70.91/x
  3. Step 3: Cross multiply
    98.45x = 135.87 × 70.91
  4. Step 4: Simplify right side
    98.45x = 9,633.86
  5. Step 5: Solve for x
    x = 9,633.86/98.45
  6. Step 6: Final answer
    x = 97.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.